#include <stdio.h>

int main(){
    int i,sum_num = 80;
    double molecule = 2;
    double denominator = 1;
    double temporary;
    double sum = 0;
    for(i = 0; i < sum_num; i++){
        sum += molecule / denominator;
        
        temporary = molecule;
        molecule = molecule + denominator;
        printf("molecule: %.2f\n", molecule);
        denominator = temporary;
        printf("denominator: %.2f\n", denominator);


    }

    printf("The sum is %.2f\n", sum);
    return 0;

}